Please don't go the RaspberryPi route for serious self-hosting, you'll regret it later when you'll realize it's not powerful enough for ie NextCloud. It can handle PiHole for example (minus digging through the historical logs / stats via its interface), but when adding more and more services (Nextcloud, Jellyfin, a VPN, home automation, etc), it will be easier to expand via VMs (Proxmox) / Docker on a single machine that you need to maintain, you'd have easier snapshot backups, single point for firewall rules, etc, than adding RPIs. Buy a mini server, you'll have flexibility, room for upgrade, and the costs and power consumption will be justified when scaling to multiple services.